Fuzzibunz One Size Elite (MSRP $19.95)
We bought 20 of these a few months ago on clearance, to replace some diapers that I damaged using diaper cream (more on that below). They are pocket diapers, advertised to fit 5 to 45 lbs. I would cautiously recommend them.
Dry very quickly! I can hang them in the basement and they are completely dry in about 10 hours.
Compact. They are much less bulky than other one size diapers.
Adjustable. Adjustable elastic means the size only has to be set with each size, rather than after each wash.
Small. I'm skeptical about this diaper comfortably fitting a bigger toddler. Peter is about 25lbs and nearly at the largest settings. See this review for a comparison of One Size to Perfect Size diapers.
Narrow. While it's great for reducing bulkiness, these diapers are hard to stuff.
Adjustment is difficult. Not a big deal if only one child is in diapers at a time, but if you'll be going back and forth between sizes, buttoning the elastic each time is a pain.
Tiny Tush Elite 1.1 (MSRP 19.95, volume discounts)
These are the diapers I used with Peter for the first 2+ years. They are great! Excellent customer service and made in the USA, too. They are, like all PUL diapers, easily damaged by most diaper creams. After using Desitin with them a few times, they became water repellent. I tried everything to clean them and was able to make them merely water resistant, but they never returned to their former glory. Word to the wise.
Easy to use. Easy to stuff, easy to adjust. As with Fuzzibunz, we chose snap closures, which seem to be immune to little boys trying to escape from their diapers. :-)
Fits toddlers. Peter was nowhere near to outgrowing his diapers when we stopped using them.
Adjustments after every wash. I unsnapped the sizing snaps across the front for each wash to get them clean, which means they need to be re-snapped once they're clean. Pretty minor drawback.
Not great for newborns. They don't really fit the littlest babies snugly. Some leaks around the legs and definitely bulky on really tiny tushes. :-)
Econobum ($9.95 on Amazon, volume discounts)
As the name implies, these are the cheap way to diaper. The prefolds are good quality; the covers seem like they might not last through multiple children. Still, for the price you pay, it's a good investment in my mind.